Multiple Shielding Techniques employed to reduce the inter winding capacitance to below 0.005 picofarad and increases DC Isolation to over 1000 Megaohms.
Technically any transformer that has no direct current path between its primary & secondary windings provides isolation from any kind of leakage in Current, Spikes/Surges produced in the system. Provision of electrostatic shield in between primary & secondary winding depends upon its construction, specification & performance characteristics.
Isolation / Ultra Isolation Transformer are being used to protect Electronic & Sophisticated equipments, CNC Machines from the excessive line voltage transients, spikes / surges produced in the system. Electrostatic shielding helps in grounding these spikes & not allowing to pass on to the secondary side of the transformer.
Furnace Transformer are built in delta / star connection with neutral as floating & electrostatic shielding is used to protect the furnace from any kind of Earth Fault Tripping.